Sentences with phrase «tracks on a slab»
Volunteers working in Dinosaur Cove found these latest tracks on a slab of rock, and Martin later analyzed them.
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Railway systems are designed for a 50 - year lifespan, which is calculated on the integrity of the materials used, and most railways are built along one of two common track systems: rails set on railway ties (U.S.A.) or sleepers (UK), which are then «ballasted» into beds of rock or gravel; or rails that are set onto concrete slabs.
By tracking changes in crevasses on the glaciers» surfaces, they calculated the speed at which the ice slabs were moving.